Line breaker



Patented Mar. 20, 1928.

UNITED STATES PATENT OFFICE.

LINE BREAKER.

Application filed March 10, 1927. Serial No. 174,328.

The device of the present invention may have a wide range of utility, but finds its preferred embodiment as an electric line breaker of the character commonly detach- 6 ably mounted on the cross arms of telegraph or lighting poles for breaking the loops in street lighting circuits.

An object ofthe invention is to provide a device of this character which may be conveniently mounted upon the conventional wooden pin of a pole cross arm, and which is so constructed that the looped ends of two adjacent wires may be anchored thereto with expedition and facility, and with no danger of accidental contact of the anchored loops when the latter are applied.

' Other objects are to provide a line breaker of simple, practical construction which will be rugged, durable and efficient in use, and

90 Well suited to the requirements of economi- .cal manufacture.

With the above noted and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts, as will be more fully hereinafter set forth and pointed out in the claim. The invention may be more fully understood from the following description in connection with the accompanying drawings, wherein- Fig. 1 is a side elevational view of a line breaker embodying the present invention showing the same mounted upon the usual supporting pin.

Fig. 2 is a transverse sectional view on the line 22 of Fig. 1.

In the drawings I have used the numeral 10 to designate the line breaker which is in the nature of a generally cylindrical block of insulating material, the lower side of which is recessed to provide an internally tapered and threaded socket 11 adapted to receive the tapered threaded upper end 12 of the conventional wooden pin 13 mounted 6 on a pole cross arm (not shown). Surrounding the mouth of the socket and embracing and spaced from the pin 13 is a flared depending apron or petticoat portion 14 integral with the block 10.

A pair of diametrically opposed longitudinal parallel groves 15 cut in the outer face of the block 10 extend from one end of the block to points near the opposite end thereof where their ends are intersected by a transverse bore 16. One loop 17 passes K through the bore 16 and lies in grooves 15 while a similar loop 18 occupies a similar set of groves 15 and passes through a SlIl1llar bore 16. Grooves 15 and 15 start from opposite ends of the block so that bores 16, 16 are separated by substantially the entire length of the block.

The grooves 15 are arranged approximately 90 away from the grooves 15 on the surface of the block. thereby equidistantly spacing the four grooves and disposing the axes of the two bores 16, 16 at right angles to each other.

This construction obviously prevents any possibility of electrical contacts between the two anchored loops 17, 18.

Various changes and alterations might be made in the general form and arrangements of the parts described without departing from the invention. Hence I do not wish to limit myself to the details set forth, but shall consider myself at liberty to make such changes and alterations as fairly fall within thespirit and .scope of the appended claim.

I claim:

A line breaker including a generally cylindrical block of insulating material having pairs of longitudinally extending grooves in its outer face, said grooves being spaced approximately equal distances apart, the pairs of grooves starting from the two ends of the block and extending nearly to the opposite ends thereof, and said block having transverse bores therein connecting the blind ends of the pairs of grooves, said block having a tapered threaded socket in one side thereof, and including a flared petticoat around the socket mouth.

EDWIN L. STUBBINGS. 

